I discovered Glassdoor.com this summer. This website allows you to freely see salary and interview information as well as reviews from folks that work in those companies. This information is all confidential - the only caveat is that in order to view the information, you have to submit info about your employer. Read more info about it here:

http://www.glassdoor.com/about/overview.htm

FAQ's (including how to view info if you are a student and not employed)
http://www.glassdoor.com/about/faq.htm

This may be a worthwhile website to look at if you are considering working for a company, have an interview, or just want the inside scoop on what workers are making.

http://www.glassdoor.com/index.htm